Changes in acoustics properties in the age group of 12–18 years occurred similarly to those in the younger age group (3–11 years, Table 21.2). As it rises from Tables 21.1 and 21.2, the character of increasing the SWS value in integument tissue of the forearm involved for the group of patients at the age of 12–18 years by 30 day of distraction was identical to that in age group of patients of 3–11 years. As far as graduated distraction continued, the gain in SWS for longitudinal, transverse and diagonal (135°) directions amounted to 32.9 %, 38.3 % and 39.2 %. This indirectly evidences the development of comparable by value tension state in skin in the three directions mentioned, though the SWS parameter in absolute values in the longitudinal orientation reaches maximum – 87.9 %.

On the basis of the scalars of SWS vectors there are reasons to draw a conclusion about the transfer of operated forearm skin integument to stressed-and-deformed state [3].

It should be noted that in case of surgical treatment of patients with upper limb CGAF the necessity of repeated segment lengthening arises due to the fact that lengthening of segments starts from the age of 5–7 years. This creates favourable conditions for patients’ social adaptation and motor development. That is why in case of soft-tissue component deficit the appearance of the signs of skin integument overstretching in the forearm involved (striae) may be noted in single cases. Quite by the end of fixation period the signs of skin overdistension were reduced essentially, and in the first days after the fixator removal the striae in skin of the forearm lengthened were significantly reduced as a result of successful adaptation to new biomechanical conditions, as well as owing to tissue growth in response to graduated distraction.